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The National Police Chiefs' Council said: "The increase in referrals of potential victims of slavery and trafficking is undoubtedly the result of greater awareness, understanding and reporting of modern slavery and that is something to be welcomed.

"However, it remains likely these figures represent only a snapshot of the true scale of the problem in the UK."

'Just for money'

Sang said he had been tricked by people traffickers and forced on to a plane, then hidden on lorries with other victims.

"I don't want what happened to me to happen to someone else, because it's horrible.

"They just do it for the money. They are just lying to people.

"I don't know what happened to the people I was trafficked with," he said.

Many victims of human trafficking are forced into the sex trade.

Twenty people were convicted of sex trafficking offences in just over 12 months, according to Lancashire Constabulary's East Lancashire Exploitation Team.

Image caption
A diary kept by a victim of human trafficking who was forced into the sex trade